JPH08125901A - Composite camera - Google Patents

Abstract

PURPOSE: To save power by turning a diaphragm for a silver salt film to a prescribed open state in the case of performing only video photographing and driving the diaphragm only at the time of silver film photographing. CONSTITUTION: During the normal photographing of only video, so as to let the light reception quantity of a CCD 13 be a reference value, a video diaphragm unit 11 in a reduction lens unit 10 is opend and closed and an iris diaphragm 4 for the silver salt film is left in the open state. Thus, the light quantity reaching the CCD 13 is limited in the unit 11 and the video photographing is performed with appropriate exposure at all times. Thus, the need of the power for driving the diaphragm 4 is eliminated and the power is saved. Also, at the time of performing the photographing on the silver salt film during the video photographing, by pushing a shutter button, a shutter speed and the stop value of the diaphragm 4 are decided, the diaphragm 4 is controlled and the photographing of silver salt photographs is performed with the appropriate exposure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite camera, and more particularly to a photographing device in which a still camera using a silver halide photographic film and a movie video camera are combined.

[0002]

2. Description of the Related Art Conventionally, a user has a video camera and a still-picture camera separately and uses them separately. In addition, there have been proposed ones that are configured in the same housing in a grip of a video camera or in parallel with each other in the camera, or ones in which a viewfinder section of a single-lens reflex still camera is replaced and a video camera unit is attached.

For example, in US Pat. No. 3,546,375, a movable mirror is arranged in the optical path of an objective lens for photographing,
It is disclosed that a still image and a moving image can be recorded on different recording media by selectively switching the position of the movable mirror.

Alternatively, Japanese Utility Model Application Laid-Open No. 57-96444 discloses a video camera body in which an optical photographing section for photographing on a silver salt film is provided integrally or separately as a detachable body. are doing.

Further, Japanese Patent Application Laid-Open No. 1-185533 proposes a camera with a confirmation function, which is a composite camera and displays on a monitor an image signal from a photoelectric conversion image pickup device corresponding to an image formed on a silver salt film. There is.

However, in the above-mentioned conventional example, the constituent means necessary for recording the silver salt still picture and the video recording at the same angle of view at the same time, and sharing the common function in combining the respective cameras, Sufficient solutions to measures for achieving miniaturization, technical measures for power saving, influence of various driving sounds on audio recording of video, which are allowed in conventional silver halide still cameras, etc. Did not give.

Further, in the prior art, Japanese Patent Laid-Open No. 63-247738.
In the publication, in the compound camera, a camera for controlling the aperture and the focal length of the still camera unit and the video camera unit is proposed. This is for controlling the still lens and the video lens respectively directed to the object side. It was a proposal that was involved and was not a configuration that achieved the above.

[0008]

However, in the compound camera of the above-mentioned conventional example, in the constitution in which the silver salt still picture and the video moving picture are recorded at the same time, the exposure control for appropriately taking those two images is insufficient. Met.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a compound camera capable of performing appropriate exposure control for simultaneously recording a silver salt still picture and a video image. .

[0010]

In order to achieve the above object, in the compound camera of the present invention, in claim 1, a photographing lens is arranged on the object side and the first optical member is photographed inside. Is provided on the object side of the image surface by the first lens,
In the optical member, the light beam is divided into two or more directions, one light beam forms an image on the image plane on the silver salt film, and the other light beam passes through the image forming optical system and is formed on the solid-state image sensor. In a composite camera configured to form an image and having the silver salt film diaphragm inside the photographing lens, and further having a video diaphragm inside the imaging optical system, the silver salt film diaphragm is A control means for controlling to a predetermined aperture is provided during video shooting, and in claim 2, the silver salt film diaphragm is driven during silver salt photography.
Further, according to claim 3, the aperture for silver salt film, which is driven during video recording and during silver salt photography, is the sensitivity of the silver salt film used, the shutter speed for the silver salt film, and the accumulation of the solid-state image sensor. Time, shooting subject distance, focal length of the shooting lens, F number, T number,
Control for controlling the aperture based on at least one of the aperture value of the aperture inside the imaging optical system, the presence or absence of strobe light emission, the amount of strobe light emission, subject brightness, and signal processing information of the output of the solid-state image sensor. Means is provided,
Further, in the present invention, a control means is provided for controlling the diameter of the silver salt film diaphragm so as not to block the light flux determined by the diameter of the video diaphragm when taking a silver salt photograph.

[0011]

According to the first and second aspects of the present invention, when only the video recording is performed by the compound camera of the present invention, the aperture for the silver salt film is kept in a predetermined opening state to take the silver salt photograph. By driving the diaphragm only occasionally, it is possible to save power.

According to the third aspect of the present invention, when silver halide photography is performed while video recording is being performed by the compound camera of the present invention, a sense of discomfort can be obtained by appropriately controlling the two apertures. It will be possible to take no video images and silver salt photos. In particular, when the control according to the fourth aspect is performed, the light flux reaching the solid-state image pickup device is not affected by the presence or absence of silver salt photography, so that it is possible to perform video photography without any discomfort.

[0013]

The details of the present invention will be described in more detail with reference to Examples. FIG. 1 is a left side view for explaining the function of the compound camera of the present invention. In FIG. 1, reference numeral 1 denotes an exterior cover which constitutes the present apparatus, which includes several parts such as fastening parts such as screws, and 2 denotes A lens unit for capturing an image on a silver salt film, 3 is a lens barrel for holding a lens element,
Reference numeral 4 is an iris diaphragm for silver salt photography, and 5 is a silver salt film. In this embodiment, the lens unit 2 is a zoom lens, and is linked with an automatic or manual zoom operation,
It has a variable power lens element group that can move on the optical axis and a focusing lens element group that is driven by information from an automatic focus adjustment device, which will be described later.

A shutter device 6 is arranged immediately in front of the silver salt film, and is constituted by a shutter curtain 6a, a shutter frame 6b and the like. Reference numeral 7 is a semitransparent thin film mirror for allocating an image from the subject to the silver salt film side and the video shooting device side, respectively, and 7a is an optical axis incident from the subject side,
Reference numeral 7b denotes an optical axis that passes through the semitransparent thin film mirror 7 and reaches the silver salt film side, and 7c and 7d denote optical axes reflected by the semitransparent thin film mirror 7. 8a and 8b are optical axes 7
A field lens for adjusting the pupil of the subject image, which is provided on c, 9 is a reflecting mirror for deflecting the photographing optical axis 7c, and 10 is a reduction lens unit provided on the optical axis 7d. It includes a video aperture unit 11 for capturing moving images. Reference numeral 12 is an optical low-pass filter, and 13 is a solid-state image sensor. Reference numeral 5'denotes an aerial image formed at a position equivalent to the silver salt film 5, and the reduction lens unit 10
An image is re-formed on the solid-state image pickup device 13 via. Reference numeral 14 denotes a sub-mirror that is retractable behind the semi-transparent thin film mirror 7 and guides a part of the photographing light to the automatic focus detection device 15. The automatic focus detection apparatus according to the present embodiment compares a plurality of images generated by light fluxes transmitted through a plurality of different regions of a photographing lens with a conventionally known phase difference shift detection method and compares the defocus amount on the film surface 5 with the defocus amount. The focus direction (front focus, rear focus) is detected, but since the subject image is always obtained on the solid-state image sensor 13, the blurring method based on the high-frequency image signal from the solid-state image sensor is detected. Automatic focus adjustment may be performed, or a combined method with the shift method of this embodiment may be used.

Numeral 16 is a light shielding plate which can be retracted at the time of photographing in order to prevent light leakage because the semitransparent thin film mirror 7 is used. Reference numeral 17 denotes a back lid unit which is provided to be opened and closed when the silver salt film 5 is loaded. In this embodiment,
Although a 135-type silver salt film is used, it is not limited to this, and a drop-in type film or a disc type film may be used. Reference numeral 18 denotes an electronic viewfinder unit, which monitors a video signal from the solid-state image pickup device 13 so as to monitor a video image on a small liquid crystal 19
For observation through the reflection mirror 20 and the eyepiece lens 21. The viewfinder unit is rotatable about a rotary shaft 22.

In the configuration shown in FIG. 1, the iris diaphragm 4 for silver salt still photography is always kept open during video recording of a moving image, and a predetermined diameter is reached when a release switch for silver salt still photography described later is pressed. It is narrowed down to. Therefore, at the time of shooting a moving image, the exposure is controlled only by the video aperture unit 11 in the reduction lens unit 10, and an appropriate exposure is obtained by changing the accumulation time of the image sensor and the gain of the signal processing system as necessary.

Reference numeral 23 denotes a secondary battery which is removably attached to the lower part of the apparatus, and is a common single power source for supplying all power used by the apparatus. An openable and closable barrier 25 incorporating a strobe 24 is arranged in front of the lens unit 2. Reference numeral 26 is a microphone for recording audio during video shooting, and 27 is an external terminal as an interface with an external device such as a television or a stereo device.

FIG. 2 is a top view of this embodiment, in which 28 is a cartridge chamber for the silver salt film 5, and 29 is a spool for winding the film. In this embodiment, a prewind system is adopted in which the last frame is wound up on the spool in advance when the film is loaded, and the exposed frames are sequentially rewound during shooting.

Reference numerals 30 and 31 are a zoom driving motor and a focus driving motor of the taking lens. Reference numeral 32 is a zoom button arranged at a position that can be operated by the photographer's right hand, 33 is a main mode selection switch that also serves as a power switch, 34 is a trigger button for video recording, and 35 is a silver salt. This is a still shutter button that can be used when shooting alone or when shooting moving images and silver salt still images at the same time.
On the side opposite to the operation member, a mode selection dial that can be selected and used in common for both movie shooting and still shooting such as program exposure mode, portrait mode with many open apertures, sports mode with shutter speed priority, backlight mode, etc. Three
6 is provided.

The photometry is feedback-controlled in accordance with the brightness signal level of the solid-state image pickup device 13 corresponding to the various modes. In this embodiment, the video image pickup element is electrically divided into areas and also serves as a photometric element, but a dedicated photometric element may be arranged separately.

Reference numeral 37 denotes a video tape cassette housing portion arranged on the right side of the lens unit 2. In this embodiment, a video tape having a tape width of 8 mm is used as a video recording medium. The cassette housing portion has a recording mechanism including a magnetic head cylinder, a capstan, a pinch roller, etc., and a control panel 38 for controlling recording / reproduction of a video tape on the upper surface thereof, for instructing an automatic loading operation. The eject button 39 and the like are arranged.

FIG. 3 is a block diagram for explaining the configuration of the system control of the present embodiment. When roughly classified, the camera microcomputer 40 as a control means for receiving and controlling operation inputs such as zoom, exposure, AF, and release of the camera body. Mode microcomputer 4 as control means for controlling mode setting
1. A mechanical microcomputer 42 as a control means for driving and controlling the tape recording / reproducing servomechanism is used as a core, and other components are a video signal processing board 43, an audio signal processing board 44, and a strobe board 4.
5, the power supply board 46, etc. are connected to these.

The features of the present invention having the above-described structure will be described with reference to the flowchart of FIG.

During normal video-only shooting, the process proceeds from step 2 to step 3 and the CCD obtained in step 1
By opening and closing the video aperture unit 11 provided in the reduction lens unit 10 so that the received light amount of 13 becomes the reference value, the amount of light reaching the CCD 13 which is a solid-state image sensor is limited (step 3), The iris diaphragm 4 for the silver salt film is left open to enable video shooting with proper exposure (step 4). As a result, electricity for driving the iris diaphragm 4 becomes unnecessary, and power saving can be achieved. Further, the iris diaphragm 4 for the silver salt film is larger than the video diaphragm 11 and generates noise during driving. However, when the iris diaphragm 4 is opened by the above control, noise is not generated. When the subject brightness is dark, the reference value is not satisfied even if the video aperture 11 is opened, and in that case, control is performed to lengthen the accumulation time of the CCD 13 (step 5).

Next, when a photographer wants to photograph on a silver salt film during video photographing, for example, a shutter button is pressed to take a photograph. In this case, step 2
To Step 6. When the brightness is normal, on the video side, the accumulation time of the solid-state image sensor (CCD 13) and step 1
The aperture value of the iris diaphragm inside the reduction optical system is determined from the subject brightness obtained in (step 6). Based on this information, the silver halide photography side is sensitive to the film used, the focal length of the shooting lens, the F number, and the T number (T = (F /
√τ) × 10, F is the F number, τ is the transmittance of the lens)
Then, the shutter speed and the aperture value of the iris diaphragm for silver halide film are determined (steps 7 and 8). At that time, the iris diaphragm value for silver salt film is controlled by the method of selecting the shutter speed (various shooting modes). This allows
It is possible to take a silver halide photograph with proper exposure. Further, when a strobe is used, the aperture value is determined by further considering information on the subject distance and strobe light emission amount.

At this time, the diameter of the light flux reaching the solid-state image sensor (CCD 13) is the iris diaphragm 4 for the silver salt film.
It is preferable to determine the shutter speed and control the diameter of the iris diaphragm 4 for the silver salt film so that the light beam diameter is equal to or smaller than the light flux diameter when the light beam passes through. That is, the value of the diaphragm 11 for video controlled in step 6 is compared with the value of the diaphragm 4 for film determined in step 7, and when the light flux diameter adjusted by the diaphragm 4 is smaller than the diaphragm 4, The diameter of is changed so as to be large, and the shutter speed is shifted to the high speed side instead.

Further, the same control is performed for the high-brightness subject, but the accumulation time of the solid-state image pickup element is positively shortened (step 9). Then, when the subject is dark, the aperture of the iris diaphragm 11 inside the optical system for reduction (re-imaging) is opened on the video side from the subject brightness and the accumulation time of the solid-state image sensor (CCD 13). When it is darker, the solid-state image sensor (CC
The accumulation time of D13) is lengthened, or signal processing of the output of the solid-state imaging device (for example, amplification gain of video signal) is performed. Based on these pieces of information, the silver salt photographic side determines the shutter speed and the aperture value of the iris diaphragm 4 for silver salt film from the sensitivity of the film used, the focal length of the photographing lens, and the F number. At this time, by controlling the value of the iris diaphragm 4 for the silver salt film by the shutter speed selection method (various shooting modes), it is possible to take a silver salt photograph with an appropriate exposure. Further, when a strobe is used, the aperture value is determined by further considering information on the subject distance and the strobe light emission amount.

As described above, the solid-state image sensor (CCD1
The shutter speed is determined so that the diameter of the light flux reaching 3) is equal to or less than the diameter of the light flux when passing through the iris diaphragm 4 for silver salt film, and the diameter of the iris diaphragm 4 for silver salt film is determined. When controlled, the high speed from the diaphragm 11 is not blocked by the diaphragm 4, so that it is possible to shoot a video image without a feeling of strangeness.

In the compound camera of the present invention, when it is desired to photograph only a silver salt film, it is possible to take a silver salt photograph with an appropriate exposure by the same control as described above.

[Correspondence between Invention and Embodiment] In the above embodiments, the lens unit 2 corresponds to the photographing lens of the present invention, and the semitransparent thin film mirror 7 is the first embodiment of the present invention.
The iris diaphragm 4 and the iris diaphragm 11 correspond to the silver salt photography diaphragm and the video diaphragm of the imaging optical system of the present invention, respectively, and the reduction lens unit 10 includes It corresponds to the imaging optical system of the present invention.

The above is the correspondence between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions shown in the claims or It goes without saying that any structure may be used as long as the functions of the structure of the embodiment can be achieved.

Further, the present invention may be combined with each of the above embodiments or their technical elements as required.

In addition, the present invention may be applied to a device in which all or part of the configuration of the claims or the embodiments forms one device or is combined with another device. May be an element that constitutes the.

The present invention can also be applied to optical devices other than cameras and other devices, devices applied to those cameras and optical devices and other devices, or elements constituting these devices. is there.

[0035]

As described above, according to the present invention,
It is possible to achieve a compound camera capable of performing appropriate exposure control for simultaneously recording a silver salt still picture and a video image at the same angle of view.

In particular, according to claims 1 and 2 of the present invention, when only video shooting is performed, the diaphragm for silver salt film is kept in a predetermined opening state, and only during silver salt photography.
Power can be saved by driving the diaphragm. According to the third aspect, when silver salt photography is performed during video camera photography, by properly controlling two apertures for video photography and silver salt photography, a video image and a silver image with no discomfort can be obtained. It becomes possible to take salt photos. Further, according to claim 4, since the light flux reaching the solid-state image pickup device can be prevented from being affected by the presence or absence of silver salt photography, it is possible to perform video photography without any sense of discomfort.

[Brief description of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

FIG. 2 is a top view showing the configuration of an embodiment of the present invention.

FIG. 3 is a block diagram showing a system configuration of an embodiment of the present invention.

FIG. 4 is a flowchart of an embodiment of the present invention.

[Explanation of symbols]

 1 Camera body exterior 2 Lens unit 4 Iris diaphragm for silver salt 5 Film 7 Semi-transparent thin film mirror 10 Reduction lens unit 11 Aperture unit for video 13 CCD

Claims (4)

[Claims] 1. A photographic lens is disposed on the object side, and a first optical member is provided inside the object side of an image plane of the photographic lens, and the first optical member has a light flux in two or more directions. Is divided into two parts, one light beam forms an image on the silver salt film on the image plane, and the other light beam passes through an image forming optical system to form an image on a solid-state image sensor, and In a composite camera having the aperture for silver salt film inside the lens and the aperture for video inside the imaging optical system, the aperture for silver salt film is controlled to a predetermined aperture during video shooting. A compound camera having means. 2. The composite camera according to claim 1, wherein the diaphragm for silver salt film is driven during silver salt photography. 3. A photographic lens is disposed on the object side, and a first optical member is provided inside the object side of an image plane formed by the photographic lens, and the first optical member has a light flux in two or more directions. Is divided into two parts, one light beam forms an image on the silver salt film on the image plane, and the other light beam passes through an image forming optical system to form an image on a solid-state image sensor, and In a compound camera having a diaphragm for the silver salt film inside a lens and further having a diaphragm inside the imaging optical system, the diaphragm for the silver salt film has a predetermined opening during video shooting, and a silver salt photograph. The diaphragm for silver salt film, which is driven at the time of shooting, is the sensitivity of the silver salt film used, the shutter speed for the silver salt film, the storage time of the solid-state image sensor, the shooting object distance, the focal length of the shooting lens, the F number, and the T number. Number, the imaging optics Aperture value of the video aperture inside the system,
A composite camera, characterized in that a control means for controlling an aperture is provided based on at least one of information on whether or not strobe light is emitted, the amount of strobe light emission, subject brightness, and signal processing information of the output of the solid-state image sensor. 4. A photographic lens is arranged on the object side, and a first optical member is provided inside the object side of an image plane of the photographic lens, and the first optical member has a light flux in two or more directions. Is divided into two parts, one light beam forms an image on the silver salt film on the image plane, and the other light beam passes through an image forming optical system to form an image on a solid-state image sensor, and In a compound camera having the silver salt film diaphragm inside the lens, and further having a video diaphragm inside the imaging optical system, the diameter of the silver salt film diaphragm at the time of taking a silver salt photograph,
A composite camera comprising a control means for controlling a light flux determined by a diameter of the video aperture so as not to be blocked.